The Theory of Ion-Selective Electrodes.

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  • PUNGOR Ernö
    Institute for General and Analytical Chemistry, Technical University, Budapest, Hungary and Bay Zoltan Foundation for Applied Research

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  • Theory of Ion-Selective Electrodes

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The paper discusses the anomalies of the former interpretation of the working mechanism of ion-selective electrodes. It was thoroughly discussed why the Donnan experiment could not be applied as the theoretical background of glass electrodes. It was assumed according to the Donnan interpretation that the measurable potential is produced by the transfer of the primary ion through the membrane. Since the 1960s, the author and coworkers have been investigating the problem of what can be the reason for the potential response of the electrodes. Practical measurements in connection with the response time, surface hindered reactions etc. were interpreted. Furthermore, the energy problems according to the Gibbs theory using two electrode components were investigated. It was established that the electrodes on which chemical reactions may occur with the primary ion have a surface reaction as the chemical basis of the response. For electrodes that work on the principle of the lyotropic series, surface reactions are also involved, but their response is not always Nernstian. The energy demand is covered by the charge separation at the electrode-solution interface.

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  • Analytical Sciences

    Analytical Sciences 14 (2), 249-256, 1998

    社団法人 日本分析化学会

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